<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
	<title></title>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
	<?php //phpinfo(); //xem thông tin cài đặt cho php
		echo "Hello World"."<br>"; //language construct
		print "Hello World"."<br>";
		echo "3 * 5"." 3 + 5"."<br>";
		echo 3 *5;
	?>
</body>
</html>